Tuning of RF amplitude and phase for the drift tube linac in J-PARC

SHEN Guo-Bao; Masanori Ikegami

doi:10.1088/1674-1137/33/7/014

Chinese Physics C> 2009, Vol. 33> Issue(7) : 577-582 DOI: 10.1088/1674-1137/33/7/014

Tuning of RF amplitude and phase for the drift tube linac in J-PARC

SHEN Guo-Bao ^, ,
Masanori Ikegami

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Abstract：
The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions
from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each
cavity with a phase scan method within the accuracy of 1° in phase and
1% in amplitude. The experimental results show a remarkable agreement
with the numerical model within a sufficient margin in the tuning of the last two DTL tanks. However, a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation, the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank.

References

[1]

. Yamazaki Y. The JAERI-KEK Joint Project for the High-Intensity Proton Accelerator, J-PARC. Procs of the 20th Particle Accelerator Conference. Portland, USA, 2003. 5762. Yamazaki Y. Accelerator Technical Design Report for JPARC,KEK Report 2003-13 and JAERI-Tech 2003-443. For example, Barnard J J, Lund S M. Theory of Longitudinal Beam Halo in RF Linacs I: core/test-particle formulation.Proceedings of the 1997 Particle Accelerator Conference.Vancouver, 1997. 19294. Ikegami M, Ohkawa T, Kondo Y et al. A Simulation Study on Error Effects in J-PARC Linac. Proceedings ofLINAC2004. Lubeck, Germany, 2004. 3455. Owen T L, Popovic M B, McCrory E S et al. Part. Accel.,1994, 48: 1696. Takeda H. PARMILA, Los Alamos National Laboratory Report LA-UR-98-44877. Qiang J, Ryne R D, Habib S et al. J. Comput. Phys., 2000,163: 4348. Kondo Y, Ueno A, Ikegami M et al. Particle Distributionat the Exit of the J-PARC RFQ. Proceedings of LINAC2004. Lubeck, Germany, 2004. 789. Galambos J, Aleksandrov A, Deibele C et al. PASTA -An RF Phase Scan and Tuning Application. Proceedings of Particle Accelerator Conference 2005. Knoxville, USA,2005. 149110. Jeon D. Nucl. Instrum. Methods A, 2007, 578: 37

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SHEN Guo-Bao and Masanori Ikegami. Tuning of RF amplitude and phase for the drift tube linac in J-PARC[J]. Chinese Physics C, 2009, 33(7): 577-582. doi: 10.1088/1674-1137/33/7/014

SHEN Guo-Bao and Masanori Ikegami. Tuning of RF amplitude and phase for the drift tube linac in J-PARC[J]. Chinese Physics C, 2009, 33(7): 577-582. doi: 10.1088/1674-1137/33/7/014 shu

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Received: 2008-09-09
Revised: 2008-10-31

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沈阳化工大学材料科学与工程学院沈阳 110142

Tuning of RF amplitude and phase for the drift tube linac in J-PARC

SHEN Guo-Bao ^,
Masanori Ikegami

Corresponding author: SHEN Guo-Bao,

Received Date: 2008-09-09
Accepted Date: 2008-10-31
Available Online: 2009-07-05

Abstract:

The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions
from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each
cavity with a phase scan method within the accuracy of 1° in phase and
1% in amplitude. The experimental results show a remarkable agreement
with the numerical model within a sufficient margin in the tuning of the last two DTL tanks. However, a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation, the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank.